If you still have the Windows Vista 64-bit Ultimate up for sale I'd be glad to discuss a better price with you. I am PayPal Certified and have impeccable feedback in here and on eBay. I'm known for my immediate "lightning bolt", super fast payments!
Let me know if your game.
P.S. - If you'd consider a trade I have THREE (3) SEALED - OEM - Media Center Edition 2005 complete with unused COA's and OEM Preinstallation Kits along with the Multimedia Fearture pack. We can trade 1 - 1, or work something else out.